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First, an overview

Previously, contact resistance, DC resistance, high voltage circuit breaker QJ44 type transformer coil DC bridge arms measurement routine is widely used in power system, and the test current of this kind of bridge is only mA level, it is difficult to find defects of transformer coil conductive loop conductor cross-sectional area reduction. When measuring the contact resistance of the conductive circuit of the high voltage switch, the measuring deviation is large, and the true contact resistance value is concealed due to the influence of the oxide layer between the oil film and the moving contact. Therefore, measuring the current electric power ministry standard SD301-88 "Regulations" 500KV AC electrical equipment transfer and preventive test and the new version of "electrical equipment" preventive test regulation for circuit breaker isolating switch contact resistance is not less than the prescribed DC 100A, in order to ensure the accuracy.

Intelligent circuit resistance tester using micro single chip microcomputer control, Chinese characters humanized interface, it is a special equipment for switch contact resistance, control equipment of loop resistance measurement; the test current by 100A/200A/300A/600A DC national standard recommended by GB763 in 100A/200A/300/600A (current test gear) to loop resistance or direct contact resistance measurement the first test case set time!!!, the first test of high current breaking automatic recognition!!! The LCD test current value and testing value of resistance, can print output, with 232 interface. The instrument has the advantages of accurate measurement, stable performance and convenient operation. Suitable for power, power supply department on-site high-voltage switch repair and high voltage switch factory circuit resistance test requirements.

Two, intelligent circuit resistance tester technical performance and characteristics

1, measurement range: 1-2000 resolution: 1 Omega Omega 0.1 Omega or

2, measuring current: DC 100A/200A/300A/600A (can be converted)

3, measuring accuracy: 0.5% 5 words

4, display mode: large screen Chinese character LCD

5, power: 50Hz AC220V

6, the maximum output voltage: 5V/10V DC

7, the standard output current: DC100A/200A/300A/600A

8, test current 100A/200A (100A/200A/300A) can be converted to the scene (the corresponding model).

9, intelligent circuit resistance tester voltage / current line without direction, can be arbitrary wiring.

10, test time setting range: 1 - 99S

11, the first test of the automatic identification of large current disconnection!!!